The Athletics claimed Junk off waivers from the Astros on Saturday.
Junk never appeared in a game for the Astros, and he was designated for assignment Thursday after posting a 6.14 ERA and 1.34 WHIP through 14.2 innings at Triple-A Sugar Land. He'll now presumably return to the majors as he switches organizations, though Junk will likely operate as a low-leverage arm out of the Oakland bullpen. The Athletics moved Miguel Andujar (abdomen) to the 60-day IL to open up a spot on the 40-man roster for Junk.